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Climate Adaptation Design Principles for Urban Development

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Climate Adaptation Design Principles for Urban Development Purpose of this Document The purpose of this document is to outline design principles that can be used to help develop policy and regulations for property in Honolulu’s transit-oriented development (TOD) and other urban areas that may be vulnerable to sea level rise (SLR) and other climate change-related hazards. The guidance in this document identifies recommended tools and best practices to consider in designing building sites and structures to be resilient to SLR, flooding, extreme heat, and groundwater inundation. A companion document, Climate Adaptation: Background Research, summarizes international best practices and local initiatives related to climate adaptation in the built environment, including recommendations for next steps. The companion document is available at www.honolulu.gov/tod. Why Design for Climate Resilience? Climate change will affect all aspects of addition to mitigating emissions, the City Scan here for life in Hawai‘i, from natural ecosystems to recognizes that adaptation will be needed the companion human health and the built environment. It is as SLR and other climate-related impacts Background imperative to plan for it now. Many U.S. cities intensify. This will require measures to Research are doing so by adopting new regulations protect or enhance existing development, document and design guidelines to make the built as well as determining when retreat or environment more resilient to SLR flooding, relocation is called for. heat, gradual inundation, and other hazards. Policies are being established in new and In developing this guidance, examples were existing documents, including sustainable consulted from New York, Boston, San community/development plan updates. Francisco, Miami, New Orleans, and other Changes to regulations for both public similar cities around the world to identify and private development are also being best practices applicable to Honolulu. considered, some of which are highlighted on the next page. In anticipation of more www.honolulu.gov/rep/site/ How is the City Addressing dpptod/climate_docs/Climate_ requirements to enhance resilience in Adaptation_Background.pdf Resilience to Climate Change? the planning, design, and construction of The City and County of Honolulu (the City) has building and infrastructure projects, the Scan here committed to plan for and adapt to the effects City will increasingly look for developers to for the O‘ahu of climate change through the establishment consider climate change and incorporate Resilience and actions of its Office of Climate Change, best practices for mitigation. Strategy Sustainability, and Resiliency (CCSR) and Developers and design professionals may the Honolulu Climate Change Commission. choose to utilize these principles as well Mayor’s Directive 18-2 (2018) requires all when developing new project applications, City agencies, departments, and consultants or when considering adaptation options to City projects to consider climate change for existing projects. However, the current and SLR in all City plans, programs, and regulatory framework may limit the ability capital improvement projects, and to apply to implement certain strategies. At the same planning benchmarks assuming 3.2 to 6 feet time, the discretionary review processes of SLR by the end of this century. may provide some flexibility, such as through www.resilientoahu.org/ In 2019, the CCSR prepared the O‘ahu TOD permits. resilience-strategy Resilience Strategy for the City with 44 Learning from any interim/pilot projects actions to guide implementation. The CCSR will further inform development of the is now preparing a Climate Action Plan to City’s climate change adaption policies and mitigate greenhouse gas emissions. In regulations, which are expected to take years to fully implement. 1 Climate Adaptation Design Principles for Urban Development What Regulatory Changes are Anticipated? Key City regulations and policies that have been recently updated or are in the process of being updated to incorporate resilient design principles are summarized below. Ordinances & Codes Climate Resilience Design Guidelines: Building Code: Action 14 of the City’s Resilience Strategy calls for the The City has adopted the 2012 International Building City to establish Future Conditions Climate Resilience Code (IBC) and International Residential Code (IRC), as Design Guidelines that incorporate forward-looking incorporated into the Revised Ordinances of Honolulu climate change data and provide specifications to inform (ROH) Chapter 16. the design of City and private facilities and infrastructure (essentially expanding on this document). The 2012 IBC requires new construction to be designed with one foot freeboard* above current Base Flood Stormwater Utility: Elevation (BFE) in hazardous flood zones. The 2012 In accordance with Action 31 of the City’s Resilience IRC limits impervious surfaces of some residential Strategy, the City is exploring the formation of a developments to 75 percent of the total lot area. The stormwater utility. This would establish fees for 2018 IBC is anticipated to be adopted in 2021. It contains impervious surfaces and further incentivize the use of additional provisions for resilience. green infrastructure, LID, and water conservation in new development and redevelopment. For more information, Flood Hazard Areas: see www.stormwaterutilityoahu.org. Following adoption of the 2012 IBC, amendments to ROH Chapter 21A are forthcoming to reflect changes in Urban Tree Canopy: the requirements for designing buildings in flood hazard In accordance with Action 33 of the City’s Resilience areas. Strategy, the City is establishing policies and practices that improve the management of trees to mitigate increasing Plumbing Code: temperatures resulting from climate change. Mayor’s The City is proposing updates to the Plumbing Code Directive 20-14 (2020) requires City departments and (ROH Chapter 19) that would allow more applications agencies to consider climate change mitigation and for on-site water reuse for residential and commercial environmental benefits of a healthy urban tree canopy properties. when making decisions that affect city trees. This policy Rules Related to Water Quality: requires the protection of trees that pose no threat to The 2018 update incorporates requirements for low safety and do not undermine an essential government impact development (LID), green infrastructure, and function, as well as planting more trees to expand urban source control best management practices (BMPs). Other canopy. updates are underway or expected to be formalized into A TOD Street Tree Plan is under development. This plan updated City codes and regulations within the next one will provide guidance for street tree type selection to to five years. maximize canopy and streetscape coherency in the TOD Special Management Area and Shoreline Setbacks: neighborhoods. A working group is preparing updates to regulations of How to make buildings and sites more resilient? the Shoreline Setbacks (ROH Chapter 23) and Special Management Area (ROH Chapter 25) to incorporate International, national, and local best practices and State-identified Sea Level Rise Exposure Areas (SLR-XA) tools that can be used to make buildings and sites more and improved mapping. resilient are highlighted on the following pages. These practices and tools are presented in four categories: Plans, Programs, & Policies Climate Adaptation Strategy: A: Understanding Applicable Hazards Action 28 of the City’s Resilience Strategy calls for the B: Managing Stormwater preparation of an O‘ahu Climate Adaptation Strategy, C: Design for Flooding and Sea Level Rise which the City has initiated. The Strategy is expected to D: Mitigating Extreme Heat include policy guidance and a recommended framework In addition, resilient design best practices are illustrated for approaching adaptation islandwide. However, it for three urban building typologies: will not recommend specific adaptation strategies at a regional or neighborhood scale. Regional or 1: Tower & Podium neighborhood scale adaptation strategies will need to 2: Mid-Rise continue to be developed through community, special 3: Low-Rise Walk-Up district, and functional plans. For more information, see www.climatereadyoahu.org. * Italicized terms are defined at the end of this document Climate Adaptation Design Principles for Urban Development 2 A: Understanding Applicable Hazards How to Use the Climate Ready O‘ahu Web Explorer: Explore the map by zooming A first step in resilient design is to identify and utilize around or searching by address current information on climate science and hazards or Tax Map Key (TMK), and to determine what hazards may affect the property or investigate which areas of the building site. This information can be used to inform island are projected to be at risk siting and design of structures to support reduced risk, of flooding (due to SLR and/or rainfall) and extreme heat (due enhanced safety, and long-term protection of natural to rising temperatures and the systems, people, and structures. Land use, community urban heat island effect). planning, and zoning practices are critical implementation Different layers can beturned tools for long-term hazards and financial risk mitigation on or off and expanded in the for the City, its residents, and businesses. Layers tab (stacked papers The Climate Ready O‘ahu Web Explorer icon). Some layers require (bit.ly/climatereadyoahumap) is an online mapping tool zooming in to view and take longer to
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